Again the TLD results (Table 1) show the same pattern
as the survey meter results with the 4 HASL TLD results
agreeing very well with the corresponding HASL scintillation
counter readings.
Total Exposure Rates Along the South and North End Transects

-

Short transects were made of the north and south tips of the
island.
The vegetation was not thick in these areas.
Along
the North End Transect and around an 85 ft: observation
tower, the exposure rates were typical of close-to-shore

values;

20 to 40 ur/hr.

The South End Transect was through a former construction
camp housing area.
Exposure rates were low in the open areas;

5 to 25 ur/hr.
In a small cordia grove on the lLagcon side
of the island a value of 60 ur/hr was obtained.
Other high

readings, 50 to 60 ur/hr, were noted when the survey meter
was placed near the concrete housing foundations in the area
This activity can possibly be explained as due to retentic”
of fallout which accumulated on the rough concrete surfaces
No soil sample or field spectrometric data were obtained
although a few TLD units were exposed (see Table 1}.

co

Total and Individual Isotope Exposure Rates at the Clearirg
Experiment Site - The question whether uptake of radicactive
materials by plants contributes significantly to the external
radiation field was carefully investigated.
If such uptake
were significant, clearing the brush might reduce the
radiation levels to some extent.
The area chosen for the
experiment was of quite dense vegetation, mainly scaevola
8 ft. to 10 ft. high, about 400 ft. inland from the 1800 ft.
station on the Village Road.
Initial survey meter readings
about the center of the area indicated fairly uniforr
exposure rates of about 60 ur/hr.
A full set of spectrometer
and ionization chamber measurements were made before ary
clearing began and were repéated as the area was progresSively cleared to a 10 ft., 20 ft., and 30 ft. radius.
These measurements showed no significant effect on exposure
rate or changes in the spectrum.
These results are summarized
below.

Select target paragraph3